ROLLING BEARINGS SI3N4 SILICON NITRIDE CERAMIC BALLS for rolling bearings
Ceramic rolling bodies (balls, rollers) for rolling bearings
Ceramic rolling balls for rolling bearings with high-strength,resistant to corrosion and wear
Ceramic rolling elements for bearings have provided a new level of bearing performance and reliability. Thanks to unique properties of ceramic materials (primarily silicon nitride) it has been possible to significantly improve the durability and speed characteristics of bearings.
Related Data
| Main component | 99%Al2O3 | S-SiC | ZrO2 | Si3N4 | ||
| Physical Property |
Density | g/cm3 | 3.9 | 3.1 | 6 | 3.2 |
| Water Absorption | % | 0 | 0.1 | 0 | 0.1 | |
| Sinter Temperature | °C | 1700 | 2200 | 1500 | 1800 | |
| Mechanical Property |
Rockwell Hardness | HV | 1700 | 2200 | 1300 | 1400 |
| Bend Strength | kgf/mm2 | 3500 | 4000 | 9000 | 7000 | |
| Compression Intensity | Kgf/mm2 | 30000 | 20000 | 20000 | 23000 | |
| Thermal Property |
Maximum working temperature |
°C | 1500 | 1600 | 1300 | 1400 |
| thermal expansion coefficient 0-1000°C |
/°C | 8.0*10-6 | 4.1*10-6(0-500°C) | 9.5*10-6 | 2.0*10-6(0-500°C) | |
| 5.2*10-6(500-1000°C) | 4.0*10-6(500-1000°C) | |||||
| Thermal Shock resistance | T(°C) | 200 | 250 | 300 | 400-500 | |
| Thermal Conductivity | W/m.k(25°C | 31 | 100 | 3 | 25 | |
| 300°C) | 16 | 100 | 3 | 25 | ||
| Electrical Property |
Resisting rate of Volume | ◎.cm | ||||
| 20°C | >1012 | 106-108 | >1010 | >1011 | ||
| 100°C | 1012-1013 | – | – | >1011 | ||
| 300°C | >1012 | – | – | >1011 | ||
| Insulation Breakdown Intensity |
KV/mm | 18 | semiconductor | 9 | 17.7 | |
| Dielectric Constant (1 MHz) | (E) | 10 | – | 29 | 7 | |
| Dielectric Dissipation | (tg o) | 0.4*10-3 | – | – | – | |
At present, wear-resistant parts made of ceramic materials, cemented and graphite are an integral part of pumps, compressors, turbines and pipeline fittings.
Main applications:
- installations of the electric centrifugal pumps;
- pipeline accessories;
- rod deep pum;
- pumps to maintain pattern pressur;
- rotary-plate vacuum pumps;
- sealed pum;
- plunger pumps;
- slurry and mud pumps;
- main line and supporting pum;
- power and feed pumps;
- various compressors and turbines.
Advantage of ceramic materials:
- excellent wear resistance;
- excellent corrosion resistance;
- excellent coefficient of friction;
- high thermal conductivity (heat removal from the friction zone, reduction of the temperature gradient and, accordingly, temperature stresses and deformations);
- high modulus of elasticity (resistance to force deformations);
- low temperature coefficient of linear expansion;
- manufacturability (the possibility of providing a high quality surface treatment).
Materials:
- aluminum oxide (corundum, alundum);
- silicon carbide;
- zirconia;
- cemented carbide;
- graphite and impregnated graphite.
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